those attacks on finds of the secret service when president obama was sworn in for the first time in 2009. dan bonngeno was the lead secret service agent as people packed the national mall in downtown d.c. a potential terrorist could have been hiding in plain sight. >> you can't guarantee anything. you reduce the probability to hopefully something minuscule so if something happens your response is enough to keep casualties to a minimum n times square 2010. a car bomb failed to explode and was disarmed before it could hurt anyone. two days later a pakistani-american was caught trying to board a flight to the middle east. big sporting events like the boston marathon had been viewed as inviting targets since 9/11. the marine corps marathon attracts 30,000 runners each year. super bowl organize ohhers are often criticized for too much security at the big game. and securing every possible public event that could invite an attack is respond reasonable. michaelle leiter was the counter terrorism director under president george w. bush. >> you can't protect all of the people at all of the la